It's the nicotine present in the tobacco plant that is addictive, which is why nicotine patches and sprays are useful in kicking the habit. It is alleged that the tobacco companies use additives which enhance the effect of the nicotine.

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tobacco, regardless of the additives is chemically addictive as a result of the chemical compound of nicotine...However tobacco has been studied to indicate a psychological addiction as a result of the sensory sensations your body has become use too like second nature...